How long does status last from platinum challenge this year pre-merger?

Good morning Marriott Experts!!! We are planning out our trips for the upcoming year. Currently, we have platinum premier status from the challenge we earned in April of this year (2018). Does any one know how long the status will last? From what I have read, some are saying Feb of 2020 but some are saying 12 months from the date we finished the challenge which would be April of 2019. I certainly hope the former is the case since we do the majority of our traveling in Asia during the summer (15 nights booked). We are going to try and earn the status through 50 nights this year (15 nights from credit card + 35 nights). Thanks!!!